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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Mon, 05 Oct 2026 22:50:04 +0000</lastBuildDate>
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      <title>CVE-2026-58083 — Use-after-free in kqueue copy-on-fork</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-58083</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; FreeBSD&lt;/p&gt;
&lt;p&gt;While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued on the kqueue&amp;#39;s active list before the copy was complete.  The copy routine did not account for this and could enqueue the new knote a second time, corrupting the active list.  In addition, the copy routine did not hold the appropriate locks while reading knote state, allowing further races.&lt;/p&gt;
&lt;p&gt;An unprivileged local user can trigger a use-after-free in the kernel, potentially leading to privilege escalation.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; FreeBSD&lt;/p&gt;
&lt;p&gt;While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued on the kqueue&amp;#39;s active list before the copy was complete.  The copy routine did not account for this and could enqueue the new knote a second time, corrupting the active list.  In addition, the copy routine did not hold the appropriate locks while reading knote state, allowing further races.&lt;/p&gt;
&lt;p&gt;An unprivileged local user can trigger a use-after-free in the kernel, potentially leading to privilege escalation.&lt;/p&gt;</content:encoded>
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